medium
5.8
CWE
264
Advisory Published
Updated

CVE-2014-7155

First published: Thu Oct 02 2014(Updated: )

The x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen 4.4.x and earlier does not properly check supervisor mode permissions, which allows local HVM users to cause a denial of service (guest crash) or gain guest kernel mode privileges via vectors involving an (1) HLT, (2) LGDT, (3) LIDT, or (4) LMSW instruction.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Xen XAPI<=4.4.0
Xen XAPI=3.0.2
Xen XAPI=3.0.3
Xen XAPI=3.0.4
Xen XAPI=3.1.3
Xen XAPI=3.1.4
Xen XAPI=3.2.0
Xen XAPI=3.2.1
Xen XAPI=3.2.2
Xen XAPI=3.2.3
Xen XAPI=3.3.0
Xen XAPI=3.3.1
Xen XAPI=3.3.2
Xen XAPI=3.4.0
Xen XAPI=3.4.1
Xen XAPI=3.4.2
Xen XAPI=3.4.3
Xen XAPI=3.4.4
Xen XAPI=4.0.0
Xen XAPI=4.0.1
Xen XAPI=4.0.2
Xen XAPI=4.0.3
Xen XAPI=4.0.4
Xen XAPI=4.1.0
Xen XAPI=4.1.1
Xen XAPI=4.1.2
Xen XAPI=4.1.3
Xen XAPI=4.1.4
Xen XAPI=4.1.5
Xen XAPI=4.1.6.1
Xen XAPI=4.2.0
Xen XAPI=4.2.1
Xen XAPI=4.2.2
Xen XAPI=4.2.3
Xen XAPI=4.3.0
Xen XAPI=4.3.1
Xen XAPI=4.4.0
Xen XAPI=4.4.0-rc1
Debian=7.0
Fedora=19
Fedora=20
SUSE Linux=12.3
SUSE Linux=13.1

Remedy

http://xenbits.xen.org/xsa/advisory-105.html

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2014-7155?

    CVE-2014-7155 has a medium severity rating due to its potential to allow local users to crash the guest system or escalate privileges.

  • How do I fix CVE-2014-7155?

    To fix CVE-2014-7155, upgrade to the latest Xen version that incorporates the necessary patches.

  • What types of systems are affected by CVE-2014-7155?

    CVE-2014-7155 affects Xen versions 4.4.x and earlier, along with multiple specific earlier versions.

  • Can CVE-2014-7155 lead to any security breaches?

    Yes, CVE-2014-7155 can potentially lead to security breaches by allowing local users to gain kernel mode privileges.

  • Who is impacted by CVE-2014-7155?

    Local users of HVM guests running vulnerable versions of Xen are impacted by CVE-2014-7155.

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